Owls Eat Rats, Mice, Shrews, and Small Birds

Multiple Choice

Owls eat rats, mice, shrews, and small birds. Assume that, over a period of time, an owl consumes 5,000 J of animal material. The owl loses 2,300 J in feces and owl pellets and uses 2,600 J for cellular respiration. What is the production efficiency of this owl?

A) 0.02%
B) 1%
C) 4%
D) 10%
E) 40%